Pump



Juny 22, w24, Lsowzz H. N. SCHOFIELD PUMP Filed April 24, 'i922 2 Sheets-Sheet l ravine. han.'

Judy 22 1924 1,501,922

H. N. scHoFlELD PUMP Filed April 24, 1922 v 2 snwnsneev. 2

Patented July 22, 1924..

y 1,501,922 PATENT OFFICE.

HENRY N. SCHOFIELD, OF KANSAS CITY, lVLISSOlU'RfLA PUMP.

Application filed Aprn 24, 1922. serial No. 556,202.

To all whom t may concern:

Be it known that HENRY N. SCHoFinL-D, citizen of the United States. residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Pumps; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use' the same, reference being had to the accompanying drawings, and to the iigures of reference marked thereon, which'itorm a part of this specification.

This application is a continuation in part of an application filed by me on or about September 8, 1921, 'Serial No. 499,299 and the invention described herein' relates to a circulating means for accelerating the water flow through the engine cylinder cooling system for internal combustion engines, and it is particularly applicable for use in inducing a flow of cooling water through the system independent of the thermo-Siphon action thereof.

The water in any thermo-siphO-n system must be hot before it can circulate. The water must be'kept above the'topmost radiator connection or it will not circulate. Hot days and leaky radiators at times create conditions that are insurmountable. In freezing weather, water in the thermo-Siphon system will freeze before it gets hot enough to circulate, the result being burste'd radiators, cracked cylinders, scored cylinders and pistons, burnt-out bearings, and other serious damage.'v

It is also recognized that motorefticiency rises with the water heat up to 210 degrees F. Above that there is danger of knocking, irregular or jerky operation, low gasoline mileage, burnt-out bearings, scored cylinders, and other injuries which can be eliminated or at least reduced by properly taking care of the circulating system.

The device constituting my invention is illustrated as being applied to the engine of a motor vehicle built by the Ford Motor Company of Detroit, Michigan, and certain novel details of construction particularly lends it applicable for use-in connection with that particular engine, and' as to exterior de` tails, the pump is particularly designed for attachment to that particular type of engine without changing the engine structure.

The advantages and novel construction of the invention-will be apparent by reference to the following' descriptionin connec! tion with the accompanying drawings,` in which- I 7.

Fig. 1 is a perspective view of an engine equipped with an accelerator pump constructed in accordance with my invention,

Fig. 2 is a detail perspective view of the impeller. 'f

Fig. 3 is a longitudinal sectional view through the pump. l

Fig. 4 is a perspective view ofthe same, parts being broken away to show vthe interior of the casing, and

Fig. 5 is' a cross sectional view oft-he pump. 4 Referring now to the drawings by numerals of reference: v A

1 designates an engine such as' is' coni structed by the Ford Motor Company'y 'of De-j troit, Michigan. 2 is the radiator. VA3 is the connection from the engine to the radiator and 4 is the voutlet for the radiator, usually connected to the `inlet 5 of the engine by a tubular casting 6. Prior to my invention, the outlet 4 of the radiator'fwas connected directly to the fitting 6 by a pipewhichl is now supplanted by the pump constituting the subject matter of this invention. A The pump 7 has a barrel-shaped or cylindrical body portion 8,'at one end'of which is an'offset tubular inlet 9, adapted to be connected to the outlet of the radiator so asto communicate therewith in anyA appropriate manner. At the discharge end of the barrel` shaped or tubular portion 8 is'a fconstricted,

tubular outlet portion 10, which may be fas-y tened 'directly to the inlet fitting Got the engine 1, as will be clearly seen by reference to Fig.'1. v I The tubular inlet portion`9 and the tubular outletportions 10 are arranged at obtuse angles with respect to the portion 8 soas to provide for an easy How of ,the water through the intermediate barrel 8 The parV ticular arrangement of the Vcasing is of considerable importance because -the constructicn is so Vdesigned that there 'will' be no sharp angles to'changethe direction of How sult in frictional losses due to the change of direction of the water as it iskpassed through the pump cylinder, and obviously," the easier the iow Vor the lessthe resistance, the greater will be the eici'ency of the pump and 1t is' of prime importance that the vpumpbe made to operate with high eficiency or in other words, with a minimum expenditure of power.

Located within the casingy' is a spider comprising a plurality of radial blades designated 11, 12 and 13, connected by a hub in which is a bearing ring 15 of appropriate material. The bearing ring receives the end 16 of a central, longitudinally dif'- posedimpeller shaft 17. The inipeller shaft is supported at its opposite end in a relatively long tubular bearing 18, integral with the cap 19 which. closes the end of the barrel 8 opposite to the outlet 10. The cap 19 is externally threaded, as at 20, to engage the internal threads 21 of the barrel 8 and it is provided with al flange 22 between which and the ends of the barrel is interposed a gasket 23, so as to eliminate the possibility of leakage.

The outer end of the4 tubular bearing 18 is externally threaded to receive a threaded gland 24 to compress a packing 25' between the end of the bearing and the gland, as will.

r be clearly seen by reference to Fig. 3. The

long tubular bearing 18 gives considerable stability to the shaft 17 and by providing the gland as' shown,A liability of leakage is prevented.

It will be observed by reference to Fig.- 3 that the shaft 17 extends through the gland and that it carries a pulley 26, adapted to be driven by the fan belt 27 from the crank shaft pulley 28; the fan belt 27 passing over the fan pulley 29 in the usual way. It is well to state here that the pump can be installed without disturbing the fan belt because it 'can be introduced within the loop formed by the fan belt and be oifset with respect to the fan belt shaft so that there will be frictional contact 'between the pulley 26 v.and the fan belt 27, as shown in Fig. 1. The impeller particularly illustrated in 2 is an important feature of the inven tion. It is provided with a huh 30 having" diametrically opposite recesses. only one be"- ing shown in Fig. 2 and designated 3L There is another like recess diametricallj: opposite to 31 and these two recesses receive the ends' of a key 32, which may be driven through the vshaft 17 and be received within the recesses so that the key for making the hub 30 rigid with the shaft 27 will oe hidden, and since the length of the hub 30 is substantially equal to the space between the end of theftubular bearing member 18 and the bearing ring 15, it will be observed that when` the parts are assembled, as shown in Fig. 3, it will be impossible for the hu'b 30 to become loose on the shaft 17, yet the parts may be easilyassembled. In other words,vthe shaft can 'be introduced through the tubular bearing 18 and moved up until the keyi 32 comes in'to contact with the end. of the bearing 18. Then the hub 30 of the impellerwill be slipped on the shaft so that the notches 31 align with the key 32. "lhen the gland can be tightened up, the pulley put in place and the assembly is then re to be introduced into the pump so that t end 16 of the shaft 17 can be received bearing and when the cap 19 is sc. into place, the parts will be in the position so that there can be no longitudinal play ci the hub 30. L, peller 'being loose on the shaft 17 will be eliminated.

It will be apparent that the assembly can be most conveniently made and vet the proper clearances will be provided so as to automatically adjust all of the parts in their proper co-operative relation.

The impeller blade 33 isa screw wound about the hub for 360 degrees with an open uni-mpeded space 34 between the ends 35 and 36 of the screw. By reference to Figs. 2 and V3 it will be apparent that the screw is of such construction that the thcrnio-siphoning effect of the cooling system can function unimpeded even when the pump is at rest so that in the event that thc fan belt broke or for any reason the pump was in a state of res-t, the functioning of the thermo-Siphon system would not be opposed Therefore, liabilitv of the or retarded, the space 34 providing ample if' passageway for the water to circulate independent-ly of the pump. The pump impoller. however,- does have a marked effect upon the functioning of the cooling system and I have found in actual practice that a straight, uniform blade formed as a screw with parallel sides does not give the proper c'lliciency. l have, therefore, provi-ded' a step or offset 37 on the impeller blade, thc offset or stepped portion 37 having the effect of pushing or displacing the water lougtudi nally of the barrel 8 and thereby materially.' accelerating it.

lt is also important in Va pump of this kind to provide uniform, parallel stream lines and to this end the spider blades 11. 12 and 13 are made relatively wide so that they straighten out the stream lines of the water as it leaves the impeller and cause them to flow in substantially parallelism., thereby eliminating eddies with resultant friction losses.

The rear end of the pump is provided with a whorl chamber 38,v which is in the form of an annulus. Adjacent to the rap 19 and across the top of the whorl chamber is a whorl stop, which breaks up the cire cumferential flow'so that it can be drawn into the barrel 8, the stop 39 being an effective means in preventing the pump from becoming air-bound.

I have provided a novel means for supporting the pump casing from the engine block. rit the connection flange 40 for the outlet 3 are bolts 41, which fasten the outlet vneontiae 3 to the connection 40. These are common on the previously referred to Ford engines so I utilize one of the bolts 4l as an anchor for the stay and suspending bar 42, the bar having a hole 43 at its upper end, through which the bolt 41 may pass to serve the dual purpose of fastening the bar 42 and connecting the outlet 3 to the flange 40. The bar 42 has a notch 44 to clear the casting and the bar 42 is secured intermediate its ends to an outstanding arm 45 integral with the barrel 8 and having an offset portion 46 to receive the bar 42, the bar being fastened thereto by a bolt 47. The lower end of the bar 42 projects below the arm 45 and is received in a projecting member 48 on the engine block. Therefore, the bar rests upon the part 48 and is secured at its upper end by the bolt 4l so as to provide a one-point suspension for the rear end of the pump casing, the casing being rigidly secured, however at that end by the bar,

rlhe front end of the pump casing is provided with an offset, forwardly projecting lug 49, which has a shoulder 50. The free end of the lug 49 may be inserted within the end of the metallic fitting 6 so that the end of the metallic fitting 6 will abut against the shoulder 50. Therefore, the forward end of the pump casing may have rigid contact with the fitting 6 and since the lug is on the outer side of the tubular member l0 and since it engages the inner wall of the fitting 6, it will be apparent that any tendency of the casting to fulcrum about the rod 42 when pressure is applied to the pulley 26 will be opposed. The lug also adds stability to the pump cylinder and in order to clear the side of the engine block casting I provide the inner portion of the pump casing with a flattened portion 5l so that it will not Contact with the engine block.

From the foregoingl it will be apparentthat I have provided an accelerating pump which can be inexpensively constructed, easily assembled and which will be highly efficient in inducing a fiow of water through the circulating system Without the aid of the thermo-Siphon effect and where the thermosiphon effect is present, the pump will augment it in an efficient manner.

In actual practice I have found that power required by the pump is practically nil as it makes no appreciable difference on the engine and that the various refinements above referred to all co-operate to provide an efficient inexpensive means for accomplishing the purpose for which .the invention was designed.

What I claim and desire to secure by Letters-Patent is:

y l. A pump comprising a casing having an intermediate, cylindrical portion, a circumferential recess at one end forming a whorl chamber, an inlet tube adjacent to the recessed portion, a tubular outlet at the opposite end, a partition across the chamber near the upper end thereof, a spider within the` casing comprising flat blades, the sides of which are arranged longitudinally Yof the casing, a cap closing the end of the casing distant from the outlet, a bearing in the cap.

a shaft projecting through the bearing so that one end extends within the casing and the other outside the casing, a pulley on the end of the shaft outside the casing, and an impeller on the shaft inside the casing, the impeller comprising a spiral blade extending 36() degrees around the shaft so that there will be an open unimpeded space between the ends of the blade to permit water to pass through when the blade'is still, and a bearing on the spider for supporting one end of the shaft.

2. A pump comprising a casing having an inlet and an outlet, the inlet being offset with respect to the main body of the casing and the outlet being substantially in alignment with the axis of the casing, the outlet having a shouldered lug projecting from one end thereof, an impeller within the casing, an arm projecting from the outside of the casing, and a bracket fastened to the arm, the bracket comprising a bar having an opening at one end and a notched portion below the opening, the bar being fastened intermediate its ends to the arms wherebyV the upper portion may be fastened to a support and the lower end may rest upon a support.

3. A pump comprising a casing having an inlet and an outlet, a rotary impeller within the pump comprising a spiral blade extending about the axis of the casing for substantially 360 degrees so that the spaced ends of the spiral will provide an unimpeded space between theni/ to permit water to pass therethrough when the impeller isstationary, the impeller having a stepped portion intermediate its ends so that the water moved forward by the impeller will be stepped up from the first half Lof the blade to the second half thereof in its passage through the pump casing.

4. A pump comprising a casing having an vinlet and an outlet` an impeller therein for moving the water from the inlet to the outlet, an arm on the casing, a bracket bar secured to the arm intermediate its ends, the bar being adapted to engage supports at its respective ends, and a projecting lug on the outlet end of the casing for engagement with the inner wall of a tubular support with which the outlet communicates. y

In` testimony whereof I aix my signature. A

HENRY N. soHoFiELD.. 

